 In Latin, nullum magnum ingenium sine mixtura dementiae fuit (There is no great genius without some touch of madness). This passage by Seneca is the source most often cited in crediting Aristotle with this thought, but in Problemata xxx. 1, Aristotle says: 'Why is it that all those who have become eminent in philosophy or politics or poetry or the arts are clearly melancholic?' The quote by Plato is from the Dialogue Phaedrus (245a).